My last jetting question - 07 WR450


8 replies to this topic
  • Island Boy

Posted June 18, 2008 - 05:17 PM

#1

I am 95% there with my jetting. Finally... after much trial and error... no off idle bog, no sputtering, no backfiring. The bike runs strong, crisp and smooth through all gears UNTIL I am going faster than 50 mph. I am experiencing some sputtering at constant throttle and backfiring when i let off on the throttle. What factors would cause this?

Altitude: sea level
80-90F avg. Temp
GYTR fuel screw 1.5 turns out
R&D Power pump w/ ALJ set at 40
168 Main
45 Pilot
JD Red needle, clip in 4th position
DR D full race exhaust
All free mods done

Thanks

  • Gary Murray

Posted June 18, 2008 - 05:23 PM

#2

incorrect jetting.

  • KennyMc

Posted June 18, 2008 - 06:47 PM

#3

I am 95% there with my jetting. Finally... after much trial and error... no off idle bog, no sputtering, no backfiring. The bike runs strong, crisp and smooth through all gears UNTIL I am going faster than 50 mph. I am experiencing some sputtering at constant throttle and backfiring when i let off on the throttle. What factors would cause this?

Altitude: sea level
80-90F avg. Temp
GYTR fuel screw 1.5 turns out
R&D Power pump w/ ALJ set at 40
168 Main
45 Pilot
JD Red needle, clip in 4th position
DR D full race exhaust
All free mods done

Thanks


Check this out. No resolution but some suggestions.

http://www.thumperta...ghlight=stutter

  • 123BigcoopDawg576

Posted June 18, 2008 - 09:46 PM

#4

I am 95% there with my jetting. Finally... after much trial and error... no off idle bog, no sputtering, no backfiring. The bike runs strong, crisp and smooth through all gears UNTIL I am going faster than 50 mph. I am experiencing some sputtering at constant throttle and backfiring when i let off on the throttle. What factors would cause this?

Altitude: sea level
80-90F avg. Temp
GYTR fuel screw 1.5 turns out
R&D Power pump w/ ALJ set at 40
168 Main
45 Pilot
JD Red needle, clip in 4th position
DR D full race exhaust
All free mods done

Thanks


when your doing 50mph i assume your only about 1/4 throttle and are in 5th gear right? two things....if it was me i would do a 48 pilot as 45 is stock and thats pretty lean and then i would check your throttle positioning sensor (TPS)...

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  • Island Boy

Posted June 19, 2008 - 04:23 PM

#5

incorrect jetting.


thanks smart arse.

  • kevinwr450f

Posted June 20, 2008 - 10:16 AM

#6

Did you take off the AIS? That was causing backfire on decel for me. Removed it and have not heard a pop since.

  • Island Boy

Posted June 20, 2008 - 05:43 PM

#7

Yes AIS removed. I will look into disconnecting the TPS and report back what i think.

  • Island Boy

Posted June 22, 2008 - 02:15 PM

#8

I disconnected the TPS at the 3 pin connector under the tank and taped it up. Ran the bike and guess what... Problem Solved... I did not notice any loss in power either (mentioned in the manual and some TT members experienced this). Thanx for all the help.

  • jams229

Posted June 22, 2008 - 03:26 PM

#9

I was going to tell you to fiddle with the TPS, but it appears you already have... I sure would like to know the other effects of disconnecting it.
I have heard you should keep it plugged in for off-road, but I cannot remember why. I ride about 95% off-road, but the 5% on-road can be annoying due to the "TPS Stutter" Please keep us posted.
Thanks.




 
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